Interleaving aspects in the case of Signal Space Diversity (SSD) are considered here, in particular when the SSD transmission is expected to be overlapped by a colliding non-orthogonal Ultra Reliable & Low Latency Communication (URLLC). The interleaver's depth when interleaving I and Q components of a rotated modulated symbol is chosen such that a gap of at least an expected maximum size, measured in transmission units, of a possible colliding wireless signal, is generated between a respective In and Qn component of a same symbol n.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of transmitting a wireless signal corresponding to a data input, the method comprising: generating, from the data input, a quadrature signal comprising a real component “I” signal and an imaginary component “Q” signal, the I and Q signals providing I n and Q n values for each transmission unit n of a plurality of transmission units; rotating the quadrature signal by an angle to provide signal space diversity thereby generating rotated I and Q signals; and interleaving the rotated I and Q signals to leave a gap of at least L transmission units between corresponding I n and Q n values for each of the transmission units n of the plurality of transmission units, wherein L is selected to be equal to or greater than an expected maximum size, measured in transmission units, of a possible colliding wireless signal, thereby generating interleaved I and Q signals.
2. The method of claim 1 further comprising: recombining the interleaved I and Q signals into a combined signal; and mapping the combined signal onto the plurality of transmission units for transmission via a wireless interface.
3. The method of claim 1 wherein interleaving the rotated I and Q signals comprises interleaving only one of the rotated I and Q signals.
4. The method of claim 1 wherein the interleaving of the rotated I and Q signals is carried out for the I and Q signals to be transmitted in one sub-carrier and wherein L is selected to be equal to or greater than an expected maximum size of the possible colliding wireless signal in the one sub-carrier.
5. The method of claim 1 wherein interleaving the rotated I and Q signals comprises: letting a first signal of the rotated I and Q signals go through without rearranging the first signal performing a cyclic shift of size L of the second signal of the rotated I and Q signals.
6. The method of claim 1 wherein interleaving the rotated I and Q signals comprises: determining a maximum length N of a slot for transmitting a possible colliding signal; interleaving the rotated I and Q signals comprises re-odering the values of a first signal of the rotated I and Q signals comprises in a reverse order for a group of 2N consecutive values of the first signal and maintaining the order of the corresponding 2N values for the other signal of the rotated I and Q signals.
7. The method of claim 1 further comprising transmitting an indication of the selected L to one or more terminals.
8. The method of claim 1 wherein a transmission unit is a resource element.
9. A method of receiving a wireless signal, the method comprising receiving, from a wireless interface, a combined complex signal sent using a plurality of transmission units; splitting the complex signal into a real component “I” signal and an imaginary component “Q” signal, the split I and Q signals providing I n and Q n values for each transmission unit n of a plurality of transmission units; de-interleaving the split I and Q signals to reverse an interleaving function to generate de-interleaved I and Q signals, wherein the de-interleaving is configured to re-order the split I n and Q n values to attempt to recover pre-interleaving I and Q signals, wherein the interleaving function introduces a gap of at least L transmission units between corresponding pre-interleaved I n and Q n values for each of the transmission units and wherein L is selected to be equal to or greater than an expected maximum size, measured in transmission units, of a possible colliding wireless signal.
10. The method of claim 9 further comprising: applying a reverse modulation and rotation function to each of the de-interleaved I and Q signals to attempt to recover a data input used for generating the combined complex signal received via the wireless interface.
11. The method of claim 9 wherein applying a reverse modulation and rotation function comprises: pulse amplitude modulation “PAM” de-mapping each of the de-interleaved I and Q signals to attempt to recover original bits in modulated symbols used for generating the signal received as the combined complex signal, thereby generating log-likelihood ratios of the original bits for each of the de-interleaved I and Q signals; and combining the log-likelihood ratios for each of the de-interleaved I and Q signals into a combined log likelihood ratio combiner to attempt to recover the data input.
12. The method of claim 9 further comprising: receiving an indication of a plurality of transmission units where the combined complex signal was affected by a colliding wireless signal; wherein applying a reverse modulation and rotation function comprises: for each value of the de-interleaved I and Q signals that was transmitted in one of the plurality of transmission units, applying a reverse modulation and rotation function where the each value is associated with a low certainty or is replaced with a zero value.
13. The method of claim 9 further comprising: receiving the parameter L from a network element; de-interleaving the split I and Q signals based on the received L parameter.
14. A base station for transmitting, in a telecommunications network, a wireless signal corresponding to a data input, the base station being configured to: generate, from the data input, a quadrature signal comprising a real component “I” signal and an imaginary component “Q” signal, the I and Q signals providing In and Qn values for each transmission unit n of a plurality of transmission units; rotate the quadrature signal by an angle to provide signal space diversity thereby generating rotated I and Q signals; and interleave the rotated I and Q signals to leave a gap of at least L transmission units between corresponding In and Qn values for each of the transmission units n of the plurality of transmission units, wherein L is selected to be equal to or greater than an expected maximum size, measured in transmission units, of a possible colliding wireless signal, thereby generating interleaved I and Q signals.
15. The base station of claim 14 being further configured to: recombining the interleaved I and Q signals into a combined signal; and mapping the combined signal onto the plurality of transmission units for transmission via a wireless interface.
16. A terminal for receiving a wireless signal in a telecommunications network, the terminal being configured to: receive, from a wireless interface, a combined complex signal sent using a plurality of transmission units; split the complex signal into a real component “I” signal and an imaginary component “Q” signal, the split I and Q signals providing I n and Q n values for each transmission unit n of a plurality of transmission units; de-interleave the split I and Q signals to reverse an interleaving function to generate de-interleaved I and Q signals, wherein the de-interleaving is configured to re-order the split I n and Q n values to attempt to recover pre-interleaving I and Q signals, wherein the interleaving function introduces a gap of at least L transmission units between corresponding pre-interleaved I n and Q n values for each of the transmission units and wherein L is selected to be equal to or greater than an expected maximum size, measured in transmission units, of a possible colliding wireless signal.
17. The terminal of claim 16 further configured to: apply a reverse modulation and rotation function to each of the de-interleaved I and Q signals to attempt to recover a data input used for generating the combined complex signal received via the wireless interface.
18. The terminal of claim 16 wherein the terminal being configured to apply a reverse modulation and rotation function comprises the terminal being configured to: pulse amplitude modulation “PAM” de-map each of the de-interleaved I and Q signals to attempt to recover original bits in modulated symbols used for generating the signal received as the combined complex signal, thereby generating log-likelihood ratios of the original bits for each of the de-interleaved I and Q signals; and combine the log-likelihood ratios for each of the de-interleaved I and Q signals into a combined log likelihood ratio combiner to attempt to recover the data input.
19. The terminal of any of claim 16 being further configured to: receive an indication of a plurality of transmission units where the combined complex signal was affected by a colliding wireless signal; wherein terminal being configured to apply a reverse modulation and rotation function comprises the terminal being configured to: for each value of the de-interleaved I and Q signals that was transmitted in one of the plurality of transmission units, apply a reverse modulation and rotation function where the each value is associated with a low certainty or is replaced with a zero value.
20. The terminal of any of claim 16 being further configured to: receive the parameter L from a network element; de-interleave the split I and Q signals based on the received L parameter.
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September 18, 2017
March 3, 2020
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